β-adrenergic blocking agent
Definition: a class of drugs that competes with β-adrenergic agonists for available receptor sites; some compete for both β1 and β2 receptors (propranolol) whereas others are primarily either β1 (metoprolol) or β2 blockers; used in the treatment of a variety of cardiovascular diseases for which β-adrenergic blockade is desirable.
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Examples: glitazone, GI cocktail, etc.